Micrometer



March 21,1944 w. H. COWARD 4 2,344,498

MICROMETER Filed Dec. 22, 1942 2 Sheets-Sheet l March 21,1944. w. H. COWARD MICROMETER F iled Dec. 22, 1942 2 Sheets-Sheet 2 I 11 am to r M'Zlmm Harpy Coward B; I 2m Patented Mar. 21, 1944 UNITED STATES serum OFFICE MICROMETER William Harvey Coward, New Rochelle, N. Y.

Application December 22, 1942, Serial No. 469,834

1 Claim. (01. 33-147) The present invention relates to new and useful improvements in micrometers, and has for its primary object to provide, in a manner as hereinafter set forth, an instrument of this character which is adapted to accurately measure work while it is revolving in a lathe, thus greatly speeding production,

Another very important object of the invention is to provide a micrometer of the aforementioned character comprising a novel construction and arrangement whereby the instrument will be prevented from being damaged in the event that it is subjected to sudden shock or thrust.

Other objects of the invention are to provide a micrometer of the character described which will be comparatively simple in construction, strong, durable, highly efficient and reliable in use, compact, light in weight, and which may be manufactured at low cost.

' of the spindle Hi accommodates the ball contact i l.

Threaded for adjustment in the inner end portion of the opening 2 is a bushing or the like 15, An anvil I? is slidably mounted in the bushing it. The anvil ll includes a head I8 on its inner end. Mounted to revolve freely in the cuter end portion of the anvil H is a ball contact I 9. A. plug 20 is threaded into the outer portion of the opening 2. A coil spring 2| between the plug Zii and the anvil l1 yieldingly urges the latter toward the contact M.

It is thought that the operation of the instru- All of the foregoing and still further objects cu ment will be readily apparent from a consideraand advantages of th invention will become aption of the foregoing. Briefly, the dial indicator parent from a study of the following specification, I2 is set at zero. The thimble 9 is then screwed taken in connection with the accompanying down in the usual manner to the work until the drawings wherein like characters of reference dial. indicator !2 registers (plus) over the Zero design-ate corresponding parts throughout the 5 setting. The thimble 9 is then screwed back to several views, and wherein: zero. The reading is then taken from the sleeve Figure l is a view in side elevation of a mi- 6 and the thimble 9 in the usual manner. If the crometer constructed in accordance with the instrument is subjected to udden thrust, the present invention. sleeve 6 is forced out of the opening 3, thereby Figure 2 is a plan view of the instrument. 3o preventing the delicate mechanism of the instru- Figure 3 is an end elevational view. ment from being damaged. When the sleeve 6 Figure 4 is a cross sectional View, taken subis reinserted in the opening 3, seating f the stantially on the line 4-4 of Figure 1. shoulder T on the seat 4 facilitates correct ad- Figure is a view principally in longitudinal j tm nt section, taken substantially on the line 55 of It is believed that the many advant o a Figure 2, micrometer constructed in accordance with the Figure 6 is cross Sectional View, t k 511bpresent invention will be readily understood, and stantially on the line 6-6 of Figure 5. although a preferred embodiment of the device Referring now to the drawing in detail, it will is as illustrated and described, it is to be underbe seen that the embodiment of the invention 40 stood that changes in the details of construction which has been illustrated comprises a U frame and in the combination and arrangement of parts I of suitable metal. The end portions of the may be resorted to which will fall Within the frame I have formed therein aligned openings 2 scope of the invention as claimed, and 3.- An annular seat 4 is provided at an in- What is claimed is: termediate point in the opening 3. The inner A m crometer comprising a U frame having end portion 5 of the opening 3 is tapered and aligned openings in its end portions, an annular threaded, seat in one of the openings at an intermediate Removably mounted in the opening 3 is a sleeve point, the inner end portion of said one opening 6 comprising a shoulder 1 which is engageable being threaded and tapered, a sleeve removably with the seat 4. A longitudinally slotted, extermounted in said one opening and including a nally threaded and tapered nut 8 is screwed into shoulder engageable on the seat, a contractible the portion 5 of the opening 3 over the adjacent nut threaded into the inner end portion of said end portion of the sleeve 6 for frictionally seone opening and engaged with the sleeve for friccuring said sleeve in position. tionally securing said sleeve in position, a thimble Threadedly mounted for adjustment on the threaded for adjustment on the sleeve, and a sleeve 6 is a thimble 9. The thimble 9 carries spindle on the thimble integral therewith and a tubular movable spindle l0 which extends lonslidably extending through the sleeve into the gitudinally through the sleeve 6 into the frame I. frame for engagement with the work.

The outer or closed end of the thimble 9 is provided with a chuck H. The chuck ll con- WILLIAM HARVEY COWARD. 

